The energy that leaves or enters a system during a chemical reaction comes from what source *
The building and breaking of chemical bonds
the conversion of mass to energy
Heat absorbed by the surroundings
The kinetic energy or electron motion

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)